Russell
1 MW
I have three similar bikes on which I have I've used a range of tires from 700Cx23mm to 700Cx47mm and I have found that the average speed difference over 20+ miles when moving up even several tire sizes is slim when human-powered and essentially zip with electric assist. There's no doubt knobby mountain tires add significant drag but I'm talking street "slicks" here so given the choice I ride the largest tire I can fit on a bike because when properly inflated they offer better comfort and stability. After the standard equipment 47mm Continental City Contact tires on my Kona Smoke wear out I'll be replacing them with either Schwalbe Marathon Supremes or Big Apples in the 50mm (2.0) size or the BA's in the 60mm (2.35) size. I would likely run the 50’s close to the 40 psi front / 50 psi rear I use in the 47mm Continentals and the 60's at no more than 30 psi front / 40 psi rear.
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